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| 型號： | MCP2150DM |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 8/52頁 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR MCP2150 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，IrDA |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MCP2150 |
| 主要屬性： | 帶 PIC18F MCU 的 IrDA 控制器 |
| 次要屬性： | USB 接口 |
| 已供物品： | 板 |
| 產(chǎn)品目錄頁面： | 685 (CN2011-ZH PDF) |
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MCP2150
DS21655B-page 16
Preliminary
2002 Microchip Technology Inc.
2.9.3.2
Discovery Mode
Discovery mode allows the Primary device to deter-
mine the capabilities of the MCP2150 (Secondary
device). Discovery mode is entered once the MCP2150
(Secondary device) has sent an XID response to the
Primary device and the Primary device has completed
sending the XIDs and then sends a Broadcast ID. If this
sequence is not completed, then a Primary and
Secondary device can stay in NDM indefinitely.
When the Primary device has something to do, it
initiates Discovery. Discovery has two parts. They are:
Link initialization
Resource determination
The first step is for the Primary and Secondary devices
to determine, and then adjust to, each other’s hardware
capabilities. These capabilities are parameters like:
Data rate
Turn around time
Number of packets without a response
How long to wait before disconnecting
Both the Primary and Secondary device begin commu-
nications at 9600 baud, which is the default baud rate.
The Primary device sends its parameters, then the
Secondary device responds with its parameters. For
example, if the Primary supports all data rates up to
115.2 kbaud and the Secondary device only supports
19.2 kbaud, the link will be established at 19.2 kbaud.
Once the hardware parameters are established, the
Primary device must determine if the Secondary device
has the resources it requires. If the Primary device has
a job to print, then it must know if it’s talking to a printer,
not a modem or other device. This determination is
made using the Information Access Service (IAS). The
job of the Secondary device is to respond to IAS que-
ries made by the Primary device. The Primary device
must ask a series of questions like:
What is the name of your service?
What is the address of this service?
What are the capabilities of this device?
When all the Primary device’s questions are answered,
the Primary device can access the service provided by
the Secondary device.
During Discovery mode, the MCP2150 handles all
responses to the Primary device (see Figure 2-10)
without any communication with the Host Controller.
The Host Controller is inhibited by the CTS signal of the
MCP2150 from sending data to the MCP2150.
2.9.3.3
Normal Connect Mode (NCM)
Once discovery has been completed, the Primary
device and MCP2150 (Secondary device) can freely
exchange data.
The MCP2150 can receive IR data or serial data, but
not both simultaneously. The MCP2150 uses a hard-
ware handshake to stop the local serial port from
sending data while the MCP2150 is receiving IR data.
Both the Primary device and the MCP2150 (Secondary
device) check to make sure that data packets are
received by the other without errors. Even when data is
required to be sent, the Primary and Secondary
devices will still exchange packets to ensure that the
connection hasn’t, unexpectedly, been dropped. When
the Primary device has finished, it then transmits the
close link command to the MCP2150 (Secondary
device). The MCP2150 will confirm the close link com-
mand and both the Primary device and the MCP2150
(Secondary device) will revert to the NDM state.
It is the responsability of the Host Controller program to
understand the meaning of the data received and how
the program should respond to it. It’s just as if the data
were being received by the Host Controller from a
UART.
Note:
The MCP2150 is limited to a data rate of
115.2 kbaud.
Note:
Data loss will result if this hardware
handshake is not observed.
Note:
If the NCM mode is unexpectedly termi-
nated for any reason (including the Primary
device not issuing a close link command),
the MCP2150 will revert to the NDM state
10 seconds after the last frame has been
received.
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| MCP2150-I/P | 功能描述:輸入/輸出控制器接口集成電路 IrDA protocol handlr RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| MCP2150-I/P | 制造商:Microchip Technology Inc 功能描述:IC IRDA CONTROLLER 2150 DIP18 |
| MCP2150-I/SO | 功能描述:輸入/輸出控制器接口集成電路 IrDA protocol handlr RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| MCP2150-I/SO | 制造商:Microchip Technology Inc 功能描述:IRDA CONTROLLER SMD 2150 SOIC18 |
| MCP2150-I/SORVB | 制造商:Microchip 功能描述:MCP2150 Series 115.2 kBaud 64 Byte Standard Protocol Stack Controller - SOIC-18 |
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